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Using AES67 in Tesira

Tesira Dante hardware running firmware version releases 3.9 and later support use of AES67, which is a technical standard for audio over IP and audio over Ethernet interoperability. AES67 is a layer 3 protocol suite designed to allow interoperability between a variety of IP-based audio networking systems. AES67 is supported on Tesira Dante-enabled equipment such as DAN-1, TesiraFORTÉ DAN, TesiraFORTÉ X, and TC-5D. AES67 flows and channels are a subset of the Dante flow and channel counts in devices. Further information regarding device specific channel and flow counts can be found here.

AES67-enabled Dante devices use Dante flows when sharing audio with other AES67-enabled Dante devices. AES67-enabled Dante devices support simultaneous use of Dante and AES67 flows.

This article will address enabling AES67 in Tesira Dante products and basic concepts of routing AES67 audio to/from non-Dante AES67 devices. Non-Dante AES67 configuration of 3rd party devices will likely require additional configuration documentation from the respective manufacturer.

Overview

AES67 is a published standard defined by the AES and IETF that defines audio transport over IP and little more. It is intended for interoperability but is not a complete audio networking solution. The following details may help in the understanding of the standard:

  • AES67 is multicast traffic utilizing IP addresses in the 239.x.x.x/16 range. Dante devices default to addresses in the 239.69.x.x/16 range.
    • It may be necessary to manually assign a 3rd party AES67 transmitter to use an address in this range in order for AES67 transmit flows to be received by Tesira.
    • Dante devices are able to transmit AES67 flows on any IP address. However, some devices (specifically, Brooklyn II, HC and Broadway-based devices) will only subscribe to AES67 flows in the 239.x/16 address range. If you need to subscribe any of these Dante device types to an AES67 flow from a third-party device, ensure that the transmit flow is in the 239.x/16 address range.
  • Sample rate is 48kHz.
  • Flows include up to 8 channels.
  • 1 Gigabit data link is required for AES67-enabled Dante endpoints.
  • AES67-enabled Dante devices utilize PTP v1 and PTP v2 for clocking. Network switches must support both.
    • Non-Dante AES67 devices often utilize PTP v2 only.

Enabling AES67 in Tesira

To enable AES67 proceed with the following steps:

  1. Using Dante Controller software, select the appropriate Tesira Dante device and enable AES67 Mode in the Device View:

AES67 Config Step 1-3.png

  1. Once AES67 is enabled on the Tesira Dante device, the Tesira device must be rebooted via Tesira Device Maintenance or hard power cycle.
  • Similarly, if AES67 flows are changed, the Tesira device must be rebooted for the label changes to take effect.

AES67 Config Step 4.png

  1. After the Tesira device has rebooted, Dante Controller will update showing AES67 Mode is enabled:

AES67 Config Step 5 Refresh & Confirm.png

TesiraFORTÉ X should be operated in Converged Network Port mode for AES67 use. 

Dante AES67 Transmitters

To create an AES67 flow from a Dante device a unique multicast flow must be added.

In Dante Controller, create a Multicast Flow and assign the source channels to it:

AES67 Config Step 6-8 Add channels to Flow.png

Review and document Multicast Flow information. The multicast address and port information may need to be manually entered in the 3rd party AES67 receiving device if said device does not appear in the Dante Controller for routing:

AES67 Config Step 9 Review AES67 Multicast Flows.png

 

Once AES67 has been enabled on the Tesira endpoint, it can sink (receive) AES67 multicast flows. Dante Controller will only list Dante sinks in the left-hand Dante Receivers column. AES67 receivers (non-Dante devices) will not be listed.

Dante AES67 receivers

All discovered AES67 transmitters (sources) will display in blue across the top as Dante Transmitters. 

AES67-enabled Dante devices use Dante flows when sharing audio with other AES67-enabled Dante devices. AES67-enabled Dante devices support simultaneous use of Dante and AES67 flows.

Click the desired crosspoint to route audio:

AES67 Sink Routing.png

AES67 Sink Information.png

 

Channel Capabilities

Product AES67 Channels
TesiraFORTE DAN 32x32 (8 channels per flow)
TesiraFORTE X 32x32 (8 channels per flow)
TesiraCONNECT TC-5D 32x32 (8 channels per flow)
Tesira DAN-1 card

64x64 (8 channels per flow) 

 

SAP

SAP (Session Announcement Protocol) is used by Dante endpoints to announce their presence on a network. This is how Dante Controller populates its Dante Transmitter and Dante Receiver list with devices. Not all AES67 devices support SAP which means that Dante Controller will only display endpoints that have announced using SAP. In the following image, the AES67 capable non-Dante sources are displayed in blue. There are two non-Dante AES67 capable sinks on the network that are not listed under the Dante Receiver list:

This is normal if no audio.png 

  • Notice that all crosspoints in this screenshot appear to have an error. In this case, the audio route is good but no audio is present because the source is not sending audio. Once the source begins streaming audio the crosspoint indicator will return to a green check mark.

If a 3rd party AES67 device does not support SAP natively, Ravenna offers a RAV-2-SAP converter freeware.

Network switch configuration

Congratulations, now that AES67 has been enabled on the endpoints, multicast traffic is active on your audio network. This means that the network switches must be configured to support multicast traffic. Check with the switch manufacturer regarding specific configuration settings for Dante and AES67 traffic. Here are some general review points:

  • Disable Energy Efficient Ethernet (802.3az)
  • The switch must support and be able to distinguish between PTPv1 and PTPv2 timing protocols.
  • Enable IGMP v2
  • Review QoS